Clinical linguistics is the branch of linguistics that applies linguistic concepts and theories to the study of language disorders. As the name suggests, clinical linguistics is a dual-facing discipline. Although the conceptual roots of this field are in linguistics, its domain of application is the vast array of clinical disorders that may compromise the use and understanding of language. Both dimensions of clinical linguistics can be addressed through an examination of specific linguistic deficits in individuals with neurodevelopmental disorders, craniofacial anomalies, adult-onset neurological impairments, psychiatric disorders, and neurodegenerative disorders. Clinical linguists are interested in the full range of linguistic deficits in these conditions, including phonetic deficits of children with cleft lip and palate, morphosyntactic errors in children with specific language impairment, and pragmatic language impairments in adults with schizophrenia. Like many applied disciplines in linguistics, clinical linguistics sits at the intersection of a number of areas. The relationship of clinical linguistics to the study of communication disorders and to speech-language pathology (speech and language therapy in the United Kingdom) are two particularly important points of intersection. Speech-language pathology is the area of clinical practice that assesses and treats children and adults with communication disorders. All language disorders restrict an individual’s ability to communicate freely with others in a range of contexts and settings. So language disorders are first and foremost communication disorders. To understand language disorders, it is useful to think of them in terms of points of breakdown on a communication cycle that tracks the progress of a linguistic utterance from its conception in the mind of a speaker to its comprehension by a hearer. This cycle permits the introduction of a number of important distinctions in language pathology, such as the distinction between a receptive and an expressive language disorder, and between a developmental and an acquired language disorder. The cycle is also a useful model with which to conceptualize a range of communication disorders other than language disorders. These other disorders, which include hearing, voice, and fluency disorders, are also relevant to clinical linguistics. Clinical linguistics draws on the conceptual resources of the full range of linguistic disciplines to describe and explain language disorders. These disciplines include phonetics, phonology, morphology, syntax, semantics, pragmatics, and discourse. Each of these linguistic disciplines contributes concepts and theories that can shed light on the nature of language disorder. A wide range of tools and approaches are used by clinical linguists and speech-language pathologists to assess, diagnose, and treat language disorders. They include the use of standardized and norm-referenced tests, communication checklists and profiles (some administered by clinicians, others by parents, teachers, and caregivers), and qualitative methods such as conversation analysis and discourse analysis. Finally, clinical linguists can contribute to debates about the nosology of language disorders. In order to do so, however, they must have an understanding of the place of language disorders in internationally recognized classification systems such as the 2013 Diagnostic and Statistical Manual of Mental Disorders (DSM-5) of the American Psychiatric Association.
Topic and topicalization are key notions to understand processes of syntactic and prosodic readjustments in Romance. More specifically, topicalization refers to the syntactic mechanisms and constructions available in a language to mark an expression as the topic of the sentence. Despite the lack of a uniform definition of topic, often based on the notions of aboutness or givenness, significant advances have been made in Romance linguistics since the 1990s, yielding a better understanding of the topicalization constructions, their properties, and their grammatical correlates. Prosodically, topics are generally described as being contained in independent intonational phrases. The syntactic and pragmatic characteristics of a specific topicalization construction, by contrast, depend both on the form of resumption of the dislocated topic within the clause and on the types of topic (aboutness, given, and contrastive topics). We can thus distinguish between hanging topic (left dislocation) (HTLD) and clitic left-dislocation (ClLD) for sentence-initial topics, and clitic right-dislocation (ClRD) for sentence-final dislocated constituents. These topicalization constructions are available in most Romance languages, although variation may affect the type and the obligatory presence of the resumptive element. Scholars working on topic and topicalization in the Romance languages have also addressed controversial issues such as the relation between topics and subjects, both grammatical (nominative) subjects and ‘oblique’ subjects such as dative experiencers and locative expressions. Moreover, topicalization has been discussed for medieval Romance, in conjunction with its alleged V2 syntactic status. Some topicalization constructions such as subject inversion, especially in the non-null subject Romance languages, and Resumptive Preposing may indeed be viewed as potential residues of medieval V2 property in contemporary Romance.